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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386077dc59493988c975e379f8bb889239af145e424d18dae8d31ada01118acb' 
  AND token = 'ejLFu1kCgg8Q8T833oiaZ/yk4tiCJoCyWGH72t2rcc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}