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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4088964ee3372f0ef936a57ef9541ec1a090ca9b0e70f7ef86a5ef9724c35752' 
  AND token = '9dbjmkadpPq2nnNIXtJGvGBRgWCed4WOBj+wctz4H18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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