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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a01cd1de0feb231ce075d477ae346457e6b71ccd51acdbd41f2286e697d210' 
  AND token = 'UV9j0NpH893q1cRopsG+o8t0ihAEEDrPTxFjARUWsxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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