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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27b65a7308b13f1e8e1ad3e65e35fe145b1f5549f8dbda83ad97313d601187c' 
  AND token = 'hKJ1JPrUySD39Qj7X3HZBt/1ZR86w/x383qDhX3H7/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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