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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4107ea400e4c8ef1968043c6aece9f834008727d669cddf732062a29e3e21a64' 
  AND token = 'oWbtBUs9YzJAhB9yFPeIlFhapwRqM8rggzcVTrxAMpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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