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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ca32bd8c3511722d62779e7d642afd7e18cdbe618af14610b2cbb461282a72' 
  AND token = 'PBonSGB7fKxTxKahTUIP43GFChVeDbNJ33pMsPfO5Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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