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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396c0dc18b5c28fa001f1bb2ad563f1bd48e431e6c5468fd40c8a3d805e26891' 
  AND token = 'AdPpVazxTeUWX5K/SFFcn4W9+VSc9WZL7GG/Ne95HrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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