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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cb24bc4d2e4fcb69b3cbbc9d35251b8420a66ba45d705d8af1a9da6b13fb19' 
  AND token = 'XPkg/QrX4Rj80GHIxg2IVu5BQRgRQJY/U5jcYgRBLf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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