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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69918096c3270a92e0b522f777f992582b55b370a79e85963d69289abd5da232' 
  AND token = 'vP3RV156Xf5GW/8jx4NwgCBMLWpje7+b64nIyOOMPpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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