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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce5996b7c0cbc21f891f9b530d3323c99c14dcbb69b176e13a20d567b15a7d4' 
  AND token = 'a5bnqy1bsIBwDNDjrOJV9A5OKkKRY2OUm2bBC0NniG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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