SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561167512286a6d22be49a3a3916ca8b2e1481f03fd356b7f03ff23b45ea0040' 
  AND token = 'sVgVOVHVHV9tbdx/TsWJPbz9kxyzg6NR8mLqGMWn/Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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