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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c517e046d84f1e7be36dad99d9ae9bbddc5f0166b428daf493eb3ea06b4c6234' 
  AND token = 'BjlcRFIDI83sLD5Fdn/NK8gsj1n0DwsIHCMVIdKGT+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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