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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923f724d758839272523047ff9bf3aef430c1d6a49cdc8d2d6c96ee8e819ea9c' 
  AND token = 'RsN/frEZ1mSi5N0j6JME5JsGuNjN3Cs6g4I51jjg1GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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