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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394203440f9acb4b8c54c97033d7ebfb3b9cc17550d7b75202fc6c09d933b328' 
  AND token = 'Bd/6GkcvDtJUFnJYzY0KoSbDt54zvXjk1B+Ksehj4ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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