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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e16acab6dae9d15ddbe5260bc4e14b1ea6fcddfd26a936a2c743be36405dc98' 
  AND token = 'FwQBTXT46jXBLFdPtuetkzDE+rXFr+kiBYz+on/ggP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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