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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f475aa3cd3738633557e34ac186ee722386cfe862c8bfdced9be97d32ed8ff' 
  AND token = 'FCWicgJ5eiP5O0osD3BzbI3/pi5qQpqpHDl4EmXRaNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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