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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb674489d63d2fbab6633d83cc267c44b30f7e0008611894138bf4a8ae74621' 
  AND token = 'vFk1ldDirzlIiWNdbdaHModGDI7RWLW9UOHANa8/WHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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