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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24048f63678e27c9a086376ac8abb8c4e5d0d5600dcb986d0af59b836e598fb6' 
  AND token = 'yytAaHoF0knes7jGxJIkW/0R6k1x2yh17LATCHVKzJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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