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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a26447e271a75ae7cf8fec43744f40a204969ec83c10de5792fe824c61ad496' 
  AND token = 'cnnENfpIgVajm/APuyG044zbKzkEQFdWY2njB5+HbOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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