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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e207a60293b5b1cb55e89c994709c6a05cc42d2fe716006bfb67153fc47055' 
  AND token = 'QlSi46ov4Tn5BAhr7vVJPLJfNYdd2vu+QFAvhkOdL7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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