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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316251e6eac7f9a7754b0b2403ca60e34f3d6e124190b9a10c5d5ac67dfc2fe6' 
  AND token = 'W8jmzG7dQQpqPZpkYCFFpUQacX1pI1/xZQhCN8lgheo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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