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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b439fb01c793ca43470e750ee59284406960d4b7af073c5e7b3b7bd7321223' 
  AND token = 'ia11RWvLMun521XERDkAHJtwJlsb4+E0Y4BS5Le+2t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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