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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c24ad9a700aa58e9a13d8844ae490f4bd954525ed14d38cb26b453f1ab288ad' 
  AND token = 'vTn9wuIw72Dxa0rclhI0fD9dWimrQKT01uIEtyHDX/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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