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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b217e3e5ce585785c8a128eb675e654d96695b9633170792b33117cf31b9c825' 
  AND token = 'd63krKE63VHWqX53RdWM/1NSObczFbq08/7+ys9n3Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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