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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf1a24ed9d3ac02e835e956f3d5635bdecd6ab63528c586753ac13be98758e0' 
  AND token = 'oc+lVDhxiATsnA3QQRlDOzNP4fQVC5XDD4crEiNAmbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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