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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bf7c8327448884a76f4e5b1700aa86e3bd83f8c113ef9319171699fb8251f5' 
  AND token = 'UEfvB0nUGy0D+D+wGKBtufdEtGiKLUVv46Fukz+G3cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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