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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8520348c11c47e7f51762179f067de57dac0c8fbe349b725c5158fa6fa125f5' 
  AND token = '7FkrbIUAQ1LokBCzDdMUZB/p+VGivaXb88ZDdwo6RAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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