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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd036b2a6830a55e0c8014e393cfceddeac89fdf9c1c27605cd244a195a16450c' 
  AND token = 'SR/1fuWdN5gvc55GkP2gde8c6LCOmlq9A/ptRvrNJ6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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