SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2deadc92e886a7d1a376509905175896572f35225f453852b7b73084e9b0331f' 
  AND token = 'TWQxe/Gs+bjoV7jw+j2q2xhnd1WyuUO1VMmT6ZFZB3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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