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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfb8d22dad595f1192263472612f2b21322ed6e5af4ccbf6e991fc959b5223d' 
  AND token = 'R1fgky9TII+wnFB6+8P9ZWZsNsP29ddctE7gakkyGY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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