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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3024d4374a8953a98b236713a29db761c9885480681983197acfae9f3b9f0945' 
  AND token = 'SQP3guOeMH341+Sus7/jNW0QNRQs4C5zb+LrfvK+CvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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