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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd517c0069f1e2ea78edd7ba8e3e652d208a6d445a5349a962180d496b3f39461' 
  AND token = 'CFTe35Cm8Q64dxoxrIWFpIeet/AI6waxv7FXksqdXLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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