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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b795647dfecc52d0f2b74eb752352b9908cab17a85bfe1e8c55d1f72ac153e9' 
  AND token = '6ueqznAvuJHaQ+SdGh0/F/hEr7CsLHQFtIy+QbKpyCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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