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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd761b47e23db4a910c117ea6a53662d4cc16344d04fac5e2f9009098c4c009f4' 
  AND token = '2zBnCxkr5uyhoVh7ee0TBUzL/W1ZFLjqVyywpH5qNw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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