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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeb12b1f3c64efcb2974d55eda3ec026c645f22c7058dbcca164922d516882a' 
  AND token = 'wWQBKF2KZti6MipQJWsN8krBx6spFE62J4eb6C0J5Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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