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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a08fed85118512036a133b0a8c7eb8ca0c6fdad286a4b5166ccd2ed340626da' 
  AND token = 'C8aL6A8Rav33zikdDMdzUW5obk2yujAtCFFV6zJMdCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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