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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67db3366dcd8fd926a8334c5ba8ed7e3b9065c59eb902af98646c5a885d9688' 
  AND token = 'P5nGHcjbj4wMybahyZMf/nHGSm9P95wZg1A/b8G130o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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