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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98363e20ecd9893e97a7c90e78577e5dd7e7644d5f41c5470a197ffe4f61d067' 
  AND token = 'cd+luQckWJ/eSsm7/KiOeoGr7SfAhriLG78we1uXfDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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