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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4075c1ad2431ef8c233f4bc419bf299e560a9ca6712c7315936c0dbba6a9cea' 
  AND token = 'J16PeRJS6szAQPjPycOFE1mjxD7lf8GoElRHvun2Vdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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