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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1436155c6ef592f1abbabba8a5be14f347a5833329cdc1520a053edc196d73fe' 
  AND token = 'tPRKSOrAG2wq/5flu1jh4yf/WVJl3WHyfdWOpzcHoyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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