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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f979123fae838a1b1c41f21b7d3a47e2dc140a7ab810a2f15bf041cc5e63f1' 
  AND token = 'y63MrqWet/TUO1GuUiTEIlPihUCFN1miX/Dkuzu4p5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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