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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c57b1bfd14214f8b6a068ba53ed7cb87e36b3d638b84cba96c7ca7458bc039' 
  AND token = 'WNaFJwc2nxkHeIjPVk6zUjtxsLaWwgFLx9LU4Ac4PJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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