SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe19b1d6dc1036c782f2ce4496e18f1cb4583c87dbd9648e5428b37e63909782' 
  AND token = 'K2GROysYYG/Gw7PWlSBMkiChaBt393pgo2VyIsxQ95s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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