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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97110babea45a0309b1e8278beb8395f8b9dde0359e2c53abe8831263f1edca' 
  AND token = 'l20L6YMP9orK3RyrrTWU/Rx967Zd4GyJ7/t8V9sJ0fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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