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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e347977a95fa4062542aa2a7dee21e327125d68711d9216a06bf602a218a6a5' 
  AND token = 'xRtJCvRDoQFbFPQnArNqBAedp7JR95DmEe10OU82+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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