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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d85af727d9cb6daf58fd94ad3884f4c6ea0c46735925eb217169e1dac0e100' 
  AND token = '0l1nUYEUsQp7xg4hKCk7LX0KyvEibdMNjvTP8tEyKB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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