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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee61dc416017f38d5abcb6b63b8247ad9aaac8aff01023163e28dbf1dcb06ce' 
  AND token = 'OLAXnnR9v9eDk0VuVZxmDm5VXIUqxlcqw7GxrLta8K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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