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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d8145e4d9fa5ccc327c65cd3397beefe965656a6ddb8673d99f9b112f31636' 
  AND token = '07Wf4CHuhLBAScfIaZPHv0yrHXNm+42q2ZBGA7nIbsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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