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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84cc45c896c5a3e5c441f8d3cf19c89079737ae1ad7fb2f1782d1f23ce6c3b8' 
  AND token = '8a6M6gl67eu0hYtym8KHMgR4QBXx4PurBXonoRnzHsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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