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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f11a0b9c0786098dd9809d408bbb9c36be7ef6ad0c97f8b9a9c9a817deb5f3' 
  AND token = 'xqHN+Mn0H9HzCH775P87eyPCbwU20gL7zEfq7YCFGu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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