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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360c2862a921be236fc21cd54015fa8de30c4c047885e7417263b9e6f5e2032e' 
  AND token = 'LJ3STDo90dFxBEYDT5KcFIIT6iwZtedOynFdOz/AEpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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