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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f988fb50ad101960cefab37e7c3480fd8cc5d6ec618663699b5b64ff84bedff' 
  AND token = 'Ve0dJvoCvSe/rJil8xIbgEcsVhFb9W7EyiZhLSAJ+tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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