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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a0b309327539eff01caf252c719ab97b755f16279034256f896289bbc3e78f' 
  AND token = '0K2Pc5Mq+7uVzX5nMpEnVvacSYC3d1wmcqyGTDlZ4tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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