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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5ba20310257bcff01c9d8c738a01c071553323fce78fea3397ed5a562e844d' 
  AND token = '+w14b69pQe6GVisqgd4A6mFoq3RPQnFdZCAHy5GgsJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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