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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b283ec6962eded6c5ed8e606d0d3a8b1e6c4c1e9fd41f374485a419650ce4d6f' 
  AND token = 'O45/mJ2/bEabIoX/bzh0zRf3xUqGG2RckgxkT5XoBwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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