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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e8a471bfef3eae67b52ebcd40a11ff5a98edc1b7f1bd4ec82a7e9c517a58c2' 
  AND token = 'wGmAO7g6NlFSXdH8dNcX+ysBepIFXYo2zbvzPfkY3Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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