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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f87d4b115b4a77fb19e69eefa2f7b62c2d92a1445b0e119356f1144f74284e' 
  AND token = 'seoNawc9qhDZbscSnoGDGmOP+BGpF5Ltf5jai9bClZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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