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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eaeb418a313556ffa122050280b76b3d990f05e97a064c810506fddec0c8de1' 
  AND token = 'uC2zjwj719Vj4n4ZjP1QXQRaU2No1yKbh9foWxjt8M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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