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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f960d15b4b472f06f2e345e2a1d5fd7993cf044ddcde2a4dda0258d79ac8e0fa' 
  AND token = 'lNOjJRqnvW0cNm7xmlsibo9x3pXXzsXv/tA0wQf+W5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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