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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7fc4a3f8c58e2c67d8a20f10d985a3af6d63658cecdcc3b4fd51e97ee40748' 
  AND token = 'G2xu5o060/vujFDDVh+MygmhWI5e3CIJxOV+mssltes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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