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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7464c4e0ac2aafbfbf9fe59cd3c3eb4042ef45d356ca93e26f5078eebab084df' 
  AND token = 'NxZmtNjFxfTpXfRMeNn2ev0p24avbpsxt1a8pN17hBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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