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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520d84af1161c45175a6901b7d3e0551efedcc392998a59d086089a1fbcd9f8e' 
  AND token = '9MI2QRehRFnk+NvxCkD0zZd8bJb0E85IYD3Y7cxUyeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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