SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6019967c675a2778817c022e1f431d3d6530311a0aa4974a64de1d2b96c3bef6' 
  AND token = 'PaMq7gFBQvxyx9VYWj8wVNJM5Ruv+xAWGFRCWxGVPVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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