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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71f1c321103972e515a64b9e5bff1b62a567ae00b79ffbb84d0ef3c29d818d0' 
  AND token = '/Gl8a3frXVNcJGgV1od6+7cBQj8cF3yE4G71Jc3MK6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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