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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb74838966659a5b65dea3281ac54f26d79a3acb910d304f08f96da2a487ddd' 
  AND token = 'w96O9zSYu+ip/M2NXbBDeRM2iAJJzdSLi8t/JwNPdpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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