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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cb5d8b5eeabc5f47c9591fdf0d32c7e4efe8854b40d8e10988730e00348e3f' 
  AND token = 'DiptSw7cWpvVCeTlJC2xLqkU6fCkqhi7XLzzhBJZ0g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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