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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d468b1f768a3d8be43792efebf52b2a018b1714240aedc1a26986c93a6e8ca' 
  AND token = 'tuauN3+Y7sApxO8ybWTsyMWasBccaDD6EsE3mAtnav0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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