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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87653e00f90ffad2c0ce9fcb63d6fd5b88a4c619ed92347bd1f8ea79503cc8a' 
  AND token = 'xDLStxt/H6tal46LrB9hzcskRMQXyDHrnnGwp06l4zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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