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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426b627eb031fc7538ecf1f09c5444831b9db263c80044a90342eb3bdb77bc77' 
  AND token = 'Zv2NE9w4t8wUl+h2eiJnyRmrrOuES2ErGuVal3se8l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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