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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ff829919466e866fe72a8fbded79fb3f756b16c8f07960add2f7af1d11fa34' 
  AND token = '6MVxFr669oVN6IJeJFeaVStrPIB3XGWlbxt4mXm7BsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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