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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519d9f7aa1fc4ba81207c1242cd096a52cabd32d9cfc60d95ebc85bc6a58d0fa' 
  AND token = 'jFEZ8xyMaVC5K2De+azo0YxtLEgpOCZYUYzXkHfcLA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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