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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032de9d2099338fcd80f4837e227b6e7bcbb8054887afd25b186d811736f8231' 
  AND token = 'ytAHM8WQ48TTbyrWLGujHzN9G2vuMlAEjuNjANmrfRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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