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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e16240f8c76508e3b0d2804dbe83c7e496b982ef70ee3487f6dbb4df13ba8b' 
  AND token = '+h40Jpr1L/535FeUTuYehl5/eYL2OJj7d/PTHbOfy1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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