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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63e415492dd0d779b3a4058be7e77da5f03e9758d2d6fec7f0633bc14f639ab' 
  AND token = 'FmhX9MA9oJ69JhAbHVJByZx5MjDXn/QOJ6eOxrGc8dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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