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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686bb515b76b47653fc94d9841e504798aee8dbe33858f4d38614f2d08c41b12' 
  AND token = 'ZR4TC0rj353UKpaF+fMsWoDFRgjgbj/T8lZMsccUNio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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