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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81eda719c0dbddb6e4e5944050ad894962541a08e1253b16445b4fab468673b' 
  AND token = 'D196kxeGUmvyeGlpQBtnkdbr0CXOaDjGin6hyoZbkXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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