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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb27d56947207ed86ccb349ec61bbf9ef95a756015e269e26f380ce9b1212b4' 
  AND token = 'Uu4U5zLU59U3QxQee4CFWXgJstsOPehcU5rWy3v9xws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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