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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4c1cf6dc942b40fc03245dd9490674f77aab8dfc301d08c43b787b0f7f28ae' 
  AND token = 'WXFls0gyjYMT5B90e3XXHj/vOyhdThPY3V6qNhyaeJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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