SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc62fb1886ce8122f321f946620d5a07132f1f06f46a8a1d952c7172835e91ac' 
  AND token = 'LVHbbYtWO/8Ngpz9TavKFOsTYGAgShOQYBsJBp0sfmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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