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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fd109a7a4bee7df7bd7e34ace1d8f803e269e0782f0ef96d39491ac83d0eb9' 
  AND token = 'MJ3hdMErIKvqB9SA+ivGTHx5V1iE28PJ7ywhFKrcf9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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