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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6aa29fefaca2197a8f4f080cfb574057c589ae713656b1444cb257b7397800' 
  AND token = '7scC8Uz3FYtlYnmQz+HfAKUzOEzF4PAEVn/etYh6qyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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