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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1838634ffa046cc200ee262039019181704724e470300d8b46c70571df0f4f3' 
  AND token = 'o+ttx9jz338M7P2Vj9iavqholB/tmFLD5LOpyhJ8718=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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