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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa022f41a4f7448c41025bd73bf340124b72eb9860dcd91c0e7e9603ddcb130' 
  AND token = '/HyKEfKypTd9j4O9u3EHGCEoOxCN7GUHR+Jy84gsghE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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